Tie Layers for Film Compositions Containing Polyvinylidene Chloride Copolymers
Publication Date: 2003-Apr-11
The IP.com Prior Art Database
Hot fill (~ 90 - 100 C) and retort (~ 100-135 C) are two food sterilization techniques that are particularly well-suited to co-extruded films containing Polyvinylidene Chloride Copolymers (PVDC) as barrier layers. The oxygen barrier properties of PVDC are not adversely affected by the high moisture exposure associated with these two methods. One area identified for improved performance is interlayer adhesion at higher temperatures. Ethylene Vinyl Acetate (EVA) copolymers adhere PVDC well to polyolefin skins at room temperature, but the adhesion tends to drop off at higher temperatures due to the relatively low melting point of the EVA.